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1 | /* |
2 | * mcs5000_ts.c - Touchscreen driver for MELFAS MCS-5000 controller |
3 | * |
4 | * Copyright (C) 2009 Samsung Electronics Co.Ltd |
5 | * Author: Joonyoung Shim <jy0922.shim@samsung.com> |
6 | * |
7 | * Based on wm97xx-core.c |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it |
10 | * under the terms of the GNU General Public License as published by the |
11 | * Free Software Foundation; either version 2 of the License, or (at your |
12 | * option) any later version. |
13 | * |
14 | */ |
15 | |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> |
18 | #include <linux/i2c.h> |
19 | #include <linux/i2c/mcs.h> |
20 | #include <linux/interrupt.h> |
21 | #include <linux/input.h> |
22 | #include <linux/irq.h> |
23 | #include <linux/slab.h> |
24 | |
25 | /* Registers */ |
26 | #define MCS5000_TS_STATUS 0x00 |
27 | #define STATUS_OFFSET 0 |
28 | #define STATUS_NO (0 << STATUS_OFFSET) |
29 | #define STATUS_INIT (1 << STATUS_OFFSET) |
30 | #define STATUS_SENSING (2 << STATUS_OFFSET) |
31 | #define STATUS_COORD (3 << STATUS_OFFSET) |
32 | #define STATUS_GESTURE (4 << STATUS_OFFSET) |
33 | #define ERROR_OFFSET 4 |
34 | #define ERROR_NO (0 << ERROR_OFFSET) |
35 | #define ERROR_POWER_ON_RESET (1 << ERROR_OFFSET) |
36 | #define ERROR_INT_RESET (2 << ERROR_OFFSET) |
37 | #define ERROR_EXT_RESET (3 << ERROR_OFFSET) |
38 | #define ERROR_INVALID_REG_ADDRESS (8 << ERROR_OFFSET) |
39 | #define ERROR_INVALID_REG_VALUE (9 << ERROR_OFFSET) |
40 | |
41 | #define MCS5000_TS_OP_MODE 0x01 |
42 | #define RESET_OFFSET 0 |
43 | #define RESET_NO (0 << RESET_OFFSET) |
44 | #define RESET_EXT_SOFT (1 << RESET_OFFSET) |
45 | #define OP_MODE_OFFSET 1 |
46 | #define OP_MODE_SLEEP (0 << OP_MODE_OFFSET) |
47 | #define OP_MODE_ACTIVE (1 << OP_MODE_OFFSET) |
48 | #define GESTURE_OFFSET 4 |
49 | #define GESTURE_DISABLE (0 << GESTURE_OFFSET) |
50 | #define GESTURE_ENABLE (1 << GESTURE_OFFSET) |
51 | #define PROXIMITY_OFFSET 5 |
52 | #define PROXIMITY_DISABLE (0 << PROXIMITY_OFFSET) |
53 | #define PROXIMITY_ENABLE (1 << PROXIMITY_OFFSET) |
54 | #define SCAN_MODE_OFFSET 6 |
55 | #define SCAN_MODE_INTERRUPT (0 << SCAN_MODE_OFFSET) |
56 | #define SCAN_MODE_POLLING (1 << SCAN_MODE_OFFSET) |
57 | #define REPORT_RATE_OFFSET 7 |
58 | #define REPORT_RATE_40 (0 << REPORT_RATE_OFFSET) |
59 | #define REPORT_RATE_80 (1 << REPORT_RATE_OFFSET) |
60 | |
61 | #define MCS5000_TS_SENS_CTL 0x02 |
62 | #define MCS5000_TS_FILTER_CTL 0x03 |
63 | #define PRI_FILTER_OFFSET 0 |
64 | #define SEC_FILTER_OFFSET 4 |
65 | |
66 | #define MCS5000_TS_X_SIZE_UPPER 0x08 |
67 | #define MCS5000_TS_X_SIZE_LOWER 0x09 |
68 | #define MCS5000_TS_Y_SIZE_UPPER 0x0A |
69 | #define MCS5000_TS_Y_SIZE_LOWER 0x0B |
70 | |
71 | #define MCS5000_TS_INPUT_INFO 0x10 |
72 | #define INPUT_TYPE_OFFSET 0 |
73 | #define INPUT_TYPE_NONTOUCH (0 << INPUT_TYPE_OFFSET) |
74 | #define INPUT_TYPE_SINGLE (1 << INPUT_TYPE_OFFSET) |
75 | #define INPUT_TYPE_DUAL (2 << INPUT_TYPE_OFFSET) |
76 | #define INPUT_TYPE_PALM (3 << INPUT_TYPE_OFFSET) |
77 | #define INPUT_TYPE_PROXIMITY (7 << INPUT_TYPE_OFFSET) |
78 | #define GESTURE_CODE_OFFSET 3 |
79 | #define GESTURE_CODE_NO (0 << GESTURE_CODE_OFFSET) |
80 | |
81 | #define MCS5000_TS_X_POS_UPPER 0x11 |
82 | #define MCS5000_TS_X_POS_LOWER 0x12 |
83 | #define MCS5000_TS_Y_POS_UPPER 0x13 |
84 | #define MCS5000_TS_Y_POS_LOWER 0x14 |
85 | #define MCS5000_TS_Z_POS 0x15 |
86 | #define MCS5000_TS_WIDTH 0x16 |
87 | #define MCS5000_TS_GESTURE_VAL 0x17 |
88 | #define MCS5000_TS_MODULE_REV 0x20 |
89 | #define MCS5000_TS_FIRMWARE_VER 0x21 |
90 | |
91 | /* Touchscreen absolute values */ |
92 | #define MCS5000_MAX_XC 0x3ff |
93 | #define MCS5000_MAX_YC 0x3ff |
94 | |
95 | enum mcs5000_ts_read_offset { |
96 | READ_INPUT_INFO, |
97 | READ_X_POS_UPPER, |
98 | READ_X_POS_LOWER, |
99 | READ_Y_POS_UPPER, |
100 | READ_Y_POS_LOWER, |
101 | READ_BLOCK_SIZE, |
102 | }; |
103 | |
104 | /* Each client has this additional data */ |
105 | struct mcs5000_ts_data { |
106 | struct i2c_client *client; |
107 | struct input_dev *input_dev; |
108 | const struct mcs_platform_data *platform_data; |
109 | }; |
110 | |
111 | static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id) |
112 | { |
113 | struct mcs5000_ts_data *data = dev_id; |
114 | struct i2c_client *client = data->client; |
115 | u8 buffer[READ_BLOCK_SIZE]; |
116 | int err; |
117 | int x; |
118 | int y; |
119 | |
120 | err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO, |
121 | READ_BLOCK_SIZE, buffer); |
122 | if (err < 0) { |
123 | dev_err(&client->dev, "%s, err[%d]\n", __func__, err); |
124 | goto out; |
125 | } |
126 | |
127 | switch (buffer[READ_INPUT_INFO]) { |
128 | case INPUT_TYPE_NONTOUCH: |
129 | input_report_key(data->input_dev, BTN_TOUCH, 0); |
130 | input_sync(data->input_dev); |
131 | break; |
132 | |
133 | case INPUT_TYPE_SINGLE: |
134 | x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER]; |
135 | y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER]; |
136 | |
137 | input_report_key(data->input_dev, BTN_TOUCH, 1); |
138 | input_report_abs(data->input_dev, ABS_X, x); |
139 | input_report_abs(data->input_dev, ABS_Y, y); |
140 | input_sync(data->input_dev); |
141 | break; |
142 | |
143 | case INPUT_TYPE_DUAL: |
144 | /* TODO */ |
145 | break; |
146 | |
147 | case INPUT_TYPE_PALM: |
148 | /* TODO */ |
149 | break; |
150 | |
151 | case INPUT_TYPE_PROXIMITY: |
152 | /* TODO */ |
153 | break; |
154 | |
155 | default: |
156 | dev_err(&client->dev, "Unknown ts input type %d\n", |
157 | buffer[READ_INPUT_INFO]); |
158 | break; |
159 | } |
160 | |
161 | out: |
162 | return IRQ_HANDLED; |
163 | } |
164 | |
165 | static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data) |
166 | { |
167 | const struct mcs_platform_data *platform_data = |
168 | data->platform_data; |
169 | struct i2c_client *client = data->client; |
170 | |
171 | /* Touch reset & sleep mode */ |
172 | i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, |
173 | RESET_EXT_SOFT | OP_MODE_SLEEP); |
174 | |
175 | /* Touch size */ |
176 | i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER, |
177 | platform_data->x_size >> 8); |
178 | i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER, |
179 | platform_data->x_size & 0xff); |
180 | i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER, |
181 | platform_data->y_size >> 8); |
182 | i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER, |
183 | platform_data->y_size & 0xff); |
184 | |
185 | /* Touch active mode & 80 report rate */ |
186 | i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE, |
187 | OP_MODE_ACTIVE | REPORT_RATE_80); |
188 | } |
189 | |
190 | static int mcs5000_ts_probe(struct i2c_client *client, |
191 | const struct i2c_device_id *id) |
192 | { |
193 | struct mcs5000_ts_data *data; |
194 | struct input_dev *input_dev; |
195 | int ret; |
196 | |
197 | if (!client->dev.platform_data) |
198 | return -EINVAL; |
199 | |
200 | data = kzalloc(sizeof(struct mcs5000_ts_data), GFP_KERNEL); |
201 | input_dev = input_allocate_device(); |
202 | if (!data || !input_dev) { |
203 | dev_err(&client->dev, "Failed to allocate memory\n"); |
204 | ret = -ENOMEM; |
205 | goto err_free_mem; |
206 | } |
207 | |
208 | data->client = client; |
209 | data->input_dev = input_dev; |
210 | data->platform_data = client->dev.platform_data; |
211 | |
212 | input_dev->name = "MELPAS MCS-5000 Touchscreen"; |
213 | input_dev->id.bustype = BUS_I2C; |
214 | input_dev->dev.parent = &client->dev; |
215 | |
216 | __set_bit(EV_ABS, input_dev->evbit); |
217 | __set_bit(EV_KEY, input_dev->evbit); |
218 | __set_bit(BTN_TOUCH, input_dev->keybit); |
219 | input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0); |
220 | input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0); |
221 | |
222 | input_set_drvdata(input_dev, data); |
223 | |
224 | if (data->platform_data->cfg_pin) |
225 | data->platform_data->cfg_pin(); |
226 | |
227 | ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt, |
228 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data); |
229 | |
230 | if (ret < 0) { |
231 | dev_err(&client->dev, "Failed to register interrupt\n"); |
232 | goto err_free_mem; |
233 | } |
234 | |
235 | ret = input_register_device(data->input_dev); |
236 | if (ret < 0) |
237 | goto err_free_irq; |
238 | |
239 | mcs5000_ts_phys_init(data); |
240 | i2c_set_clientdata(client, data); |
241 | |
242 | return 0; |
243 | |
244 | err_free_irq: |
245 | free_irq(client->irq, data); |
246 | err_free_mem: |
247 | input_free_device(input_dev); |
248 | kfree(data); |
249 | return ret; |
250 | } |
251 | |
252 | static int mcs5000_ts_remove(struct i2c_client *client) |
253 | { |
254 | struct mcs5000_ts_data *data = i2c_get_clientdata(client); |
255 | |
256 | free_irq(client->irq, data); |
257 | input_unregister_device(data->input_dev); |
258 | kfree(data); |
259 | |
260 | return 0; |
261 | } |
262 | |
263 | #ifdef CONFIG_PM |
264 | static int mcs5000_ts_suspend(struct device *dev) |
265 | { |
266 | struct i2c_client *client = to_i2c_client(dev); |
267 | |
268 | /* Touch sleep mode */ |
269 | i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP); |
270 | |
271 | return 0; |
272 | } |
273 | |
274 | static int mcs5000_ts_resume(struct device *dev) |
275 | { |
276 | struct i2c_client *client = to_i2c_client(dev); |
277 | struct mcs5000_ts_data *data = i2c_get_clientdata(client); |
278 | |
279 | mcs5000_ts_phys_init(data); |
280 | |
281 | return 0; |
282 | } |
283 | |
284 | static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume); |
285 | #endif |
286 | |
287 | static const struct i2c_device_id mcs5000_ts_id[] = { |
288 | { "mcs5000_ts", 0 }, |
289 | { } |
290 | }; |
291 | MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id); |
292 | |
293 | static struct i2c_driver mcs5000_ts_driver = { |
294 | .probe = mcs5000_ts_probe, |
295 | .remove = mcs5000_ts_remove, |
296 | .driver = { |
297 | .name = "mcs5000_ts", |
298 | #ifdef CONFIG_PM |
299 | .pm = &mcs5000_ts_pm, |
300 | #endif |
301 | }, |
302 | .id_table = mcs5000_ts_id, |
303 | }; |
304 | |
305 | module_i2c_driver(mcs5000_ts_driver); |
306 | |
307 | /* Module information */ |
308 | MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); |
309 | MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller"); |
310 | MODULE_LICENSE("GPL"); |
311 |
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